Monarch Pass is a high mountain pass in central Colorado, in the Rocky Mountains of the western United States. The pass is located on the Continental Divide at the southern end of the Sawatch Range along the border between Gunnison and Chaffee counties, approximately 25 miles west of the town of Salida. The pass carries U.S. Highway 50 over th…Monarch Pass is a high mountain pass in central Colorado, in the Rocky Mountains of the western United States. The pass is located on the Continental Divide at the southern end of the Sawatch Range along the border between Gunnison and Chaffee counties, approximately 25 miles west of the town of Salida. The pass carries U.S. Highway 50 over the Sawatch Range, providing a route between Tomichi Creek in the upper basin of the Gunnison River on the west and the South Arkansas River, a tributary of the Arkansas River, on the east. The pass can be traversed by all vehicles under most conditions and is generally open year-round; however, 7% grades exist, and the area is prone to heavy winter snowfall, often resulting in temporary closures during severe winter storms. Ramps for runaway trucks are located about halfway down both the eastern and western sides of the pass. Much of the highway over the pass is three-lane.